inscribed with the GIA (or other laboratory) certificate number, make sure to note the location of the inscription so that you can find it again when the diamond is returned to you. Mention the inscription to the jeweler; this will not only alert the jeweler to the fact that you are aware of this security feature, it will also insure that when setting or repairing the ring the inscription is not inadvertently obscured or damaged.
Ask the jeweler to show you the diamond's inclusions with a magnifier before you leave it with him. Compare what you see under a loupe with the markings on your certificate (if your certificate does not have a diamond plot of inclusions ask the jeweler to make a simple sketch of the position and type of inclusions). Thank the jeweler for his help as you will now be able to reliably identify your diamond when you pick it up, and in the future. This will remove any temptation on the jeweler's part to switch your diamond.
If your diamond is of very high value, take it to an independent appraiser before you leave it with anyone else. Have the appraiser review the diamond and put the findings in writing. Return to the same appraiser after leaving the diamond with any third party. The appraiser can briefly re-examine the diamond to confirm that it is the same one as originally appraised.
Get more advice on how to choose a diamond using our step by step guide.
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If your diamond is